The effects of compensator design on scatter distribution and magnitude: a Monte Carlo study

G. J. Bootsma; F. Verhaegen; D. A. Jaffray

doi:10.1117/12.878779

16 March 2011 The effects of compensator design on scatter distribution and magnitude: a Monte Carlo study

G. J. Bootsma, F. Verhaegen, D. A. Jaffray

Proceedings Volume 7961, Medical Imaging 2011: Physics of Medical Imaging; 796109 (2011) https://doi.org/10.1117/12.878779
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

X-ray scatter has a significant impact on image quality in kV cone-beam CT (CBCT), its effects include: CT number inaccuracy, streak and cupping artifacts, and loss of contrast. Compensators provide a method for not only decreasing the magnitude of the scatter distribution, but also reducing the structure found in the scatter distribution. Recent Monte Carlo (MC) simulations examining X-ray scatter in CBCT projection images have shown that the scatter distribution in x-ray imaging contains structure largely induced by coherent scattering. In order to maximize the reduction of x-ray scatter induced artifacts a decrease in the magnitude and structure of the scatter distribution is sought through optimal compensator design. A flexible MC model that allows for separation of scattered and primary photons has been created to simulate the CBCT imaging process. The CBCT MC model is used to investigate the effectiveness of compensators in decreasing the magnitude and structure of the scatter distribution in CBCT projection images. The influence of the compensator designs on the scatter distribution are evaluated for different anatomy (abdomen, pelvis, and head and neck) and viewing angles using a voxelized anthropomorphic phantom. The effect of compensator material composition on the amount of contamination photons in an open field is also investigated.

Citation Download Citation

G. J. Bootsma, F. Verhaegen, and D. A. Jaffray "The effects of compensator design on scatter distribution and magnitude: a Monte Carlo study", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 796109 (16 March 2011); https://doi.org/10.1117/12.878779

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available